Wow, that is a lot of lost life due to run out. I will buy at least two new ER-20 collets. One for 1/8 and one for 3/8 since they will be my most used cutters. It makes sense that tool life would be reduced since the run out is going to put more tool load on the flutes that come closest to the metal (or plastic) you are cutting. I did add a heat sink to one of my power feed motors since it was never designed for continuous use and I was putting a very heavy duty cycle on it. Worked like a champ. Now the motor is warm not hot.

Here is link for that heat sink. Just made it on the lathe and mill out of some aluminum plate.
http://www.homemadetools.net/forum/s...9982#post71647
It is on post 8.

Cheers, JR